Is somewhat off, part 1 = is 0-100 KM/h so 50 km/h avg.
50km/h / 3600s = 13.88 m / s Avg speed first 10 seconds.
13.88m/s * 10s = 138.8 meters.
F=150kg*10.00m/s/s*=1500N
W=1500N*138.8m=208200J
P=208200J/10s=20820W
P = 2,082 KW
Next part is not 120km/h - 100km/h, it is 140+100/2 = 120km/h...